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1. Assuming random sampling is from a normal distribution with standard deviation σ = 5, if you get a sample mean of X‾ = 45 based on n = 25 subjects, what is the .95 confidence interval for µ?
2. Repeat the previous example, but compute a .99 confidence interval instead.
a study published in the archives of general psychiatry in march 2001 examined the impact of depression on a patients
The results of a survey that collected the current credit card balances for 36 undergraduate college students are given in the file "College Credit Card.'
using a table of critical t-values of the t distribution find the range of values for the p-value for testing a claim
From two censuses of a population's occupations, carried out in 2000 and 2010, the following figures were obtained (all values are in ‘000s).
The ability to pay attention and the level of stimulation in the environment. how would a researcher work around this issue?
Assuming the standard deviation of the populaiton is 0.8 year, find the 99% confidence interval estimate for the population mean.
The cross-tabulation table summarizes an NBA team's game results by game location. Calculate the expected Frequency for each cell
Suppose there was a substantial difference in the abilities of salespersons to persuade consumers to purchase the company product. Would this have an impact on your statistical analysis above? Explain.
What is the probability that a randomly selected player bats over 0.300? What is the probability that a team of 25 players has a mean that is above 0.275?
Part 1: Define and explain historical research. Explain a situation in which historical research would be appropriate. Part 2: Explain the difference between external and internal evidence and give examples of each.
What are some of the words that form clues? How does one know what is a population parameter and a test statistic?
Do the data provide sufficient evidence to conclude that the cream will improve the skin of more than 50% of women? Test using α=0.05 and the p-value method.
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